slow (youtube-)streams - problem on my side?

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https://bbs.archlinux.org – Dear guys,I noticed that my internet connection (Router and computer are connected via LAN-Cable) is slow sometimes, I notice that especially when using Youtube (on 1080p, sometimes even on 720p). There is no difference between using Youtube via Browser+Flashplugin and watch Youtube-videos as a stream in vlc. "Sometimes" means quite often and based on rules I don't see. It seems that I doesn't have that problem with streaming sites located here in Europe, but don't nail me down on this.Sometimes I even don't get a quarter of the bandwith I should have with a youtu (HowTos)